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Mice21 [21]
3 years ago
6

Can anyone tell me what a energy pyramid is

Biology
1 answer:
vovangra [49]3 years ago
5 0

An ecological pyramid is a graphical representation designed to show the biomass or bio productivity at each trophic level in a given ecosystem. Biomass pyramids show how much biomass is present in the organisms at each trophic level, while productivity pyramids show the procreation or turnover in biomass.

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An element has a half-life of 30 years. If 20 mg of this element decays over a period of 90 years, how many mg of this element w
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2.5 mg

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<em>The half-life of a substance is the time required for one half of the substance to decay. In order words, it is the time it will take for a substance to decay into  half of its initial size.</em>

For a 20 mg element with a half-life of 30 which decays over a period of 90 years;

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The second 30 years, the remaining 10 mg would have decayed to 5 mg

The third 30 years, 5mg would have decayed to 2.5 mg.

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